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@swift403 @swift-4.1.3 import Foundation func execute(_ args: [String], in directory: URL? = nil) -> (stdout: String, stderr: String) { let process = Process() process.launchPath = "/usr/bin/env" process.arguments = args if let directory = directory { process.currentDirectoryPath = directory.path } let stdoutPipe = Pipe(), stderrPipe = Pipe() process.standardOutput = stdoutPipe process.standardError = stderrPipe process.launch() process.waitUntilExit() let stdout = String(data: stdoutPipe.fileHandleForReading.readDataToEndOfFile(), encoding: .utf8) ?? "" let stderr = String(data: stderrPipe.fileHandleForReading.readDataToEndOfFile(), encoding: .utf8) ?? "" return (stdout, stderr) } execute(["df", "-m"])